The present invention relates to a drive module, more particularly to a method for mounting an encoder on the drive motor applied to the encoder mounting method improved so as to have a layout structure and the fixed structure to easily adjust the amount of the magnetic material and the sensor of the encoder, the encoder examples of a method and integrated drive module structure apply them for proper installation, the drive module structure according to the invention, comprising a drive motor and the encoder unit, a speed reducer, and braking means, wherein the encoder unit includes a drive motor and is disposed adjacent an end of the rotating shaft to rotate rotary part, by sensing the rotation angle of the rotary part comprising a sensor that measures a rotation speed of the drive motor, rotation is fixed to the magnet ring and the magnet ring which acts as a magnetic material a fixing bracket which is rotatably mounted at an end of the rotating shaft, the sensor unit includes a magnet Doedoe disposed adjacent to and, with encoder board coupled to the housing to be spaced apart a predetermined interval is fixed, is mounted on the encoder board comprises a magnetic sensor for detecting a magnet ring, the fixed bracket is doedoe connected to a rotating shaft by a retaining ring, the fixed ring is installed to surround the outer peripheral surface of the rotating shaft and the fixed bracket, a fixing ring is provided which is characterized in that the inlet is formed so that the adhesive member for fixing the mounting bracket injection.